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Name: Holmium
Symbol: Ho
Atomic Number: 67
Atomic Mass: 164.93031 g
Number of Protons/Electrons: 67
Number of Neutrons: 98
Ionic Radius: Ho3+ / 0.894 Angstrom
Metal
Melting Point: 1470.0 °C
Boiling Point: 3720.0 °C
Density @ 293 K: 8.795 g/cm3
Oxide
Melting Point: 2360.0 °C
Density cubic C: 8.4092 g/cm3
Formula: Ho2O3
Molecular weight: 377.86 g
Metal %: 87.3
Toxicity LD 50.PO: (rat) > 1000 mg/kg
Dehydrated Carbonate
Formula *: Ho2(CO3)3
Molecular weight: 509.89 g
Oxide %: 74.1
Anhydrous Chloride
Formula *: HoCl3
Molecular weight: 271.29 g
Oxide %: 69.65
Toxicity LD 50.PO: (mouse) 7200 mg/kg
Anhydrous Fluoride
Formula *: HoF3
Molecular weight: 221.93 g
Oxide %: 85.15
Hydroxide
Formula *: Ho(OH)3
Molecular weight: 215.95 g
Oxide %: 87.5
Dehydrated Nitrate
Formula *: Ho(NO3)3
Molecular weight: 350.94 g
Oxide %: 53.85
Toxicity LD 50.PO: (rat) 3000 mg/kg
Dehydrated Oxalate
Formula *: Ho2(C2O4)3
Molecular weight: 593.92 g
Oxide %: 63.6
Anhydrous sulfate
Formula *: Ho2(SO4)3
Molecular weight: 618.03 g
Oxide %: 61.15
* theoretic data
| Isotope |
Half Life |
| Ho-163 |
4570.0 years |
| Ho-165 |
Stable |
| Ho-166 |
1.1 days |
| Ho-166m |
1200.0 years |
Date of discovery: 1878
Discoverer: J.L. Soret
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Markets and applications
Electronics:
Applications for nuclear industry,
Ceramics.
Others:
Laser.
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